Challenge Handshake Authentication Protocol

(chap)

Network logon authentication. Three-way handshaking occurs. A link is established. The server agent sends a message to the machine originating the link. This machine then computes a hash function from the challenge and sends it to the server. The server determines if this is the expected response and, if so, authenticates the connection. The authentication procedure can take place once or multiple times during a session and each time it takes place the challenge can change. (Also see PAP.)

More Information

• RFC 1994